Evidence for charge Kondo effect in superconducting Tl-doped PbTe

Details Evidence for charge Kondo effect in superconducting Tl-doped PbTe Evidence for charge Kondo effect in superconducting Tl-doped PbTe

2004-09-08

arxiv.org/abs/cond-mat/0409174v2

Physics

Condensed Matter

Strongly Correlated Electrons

3 figures, 4 pages

Scientific paper

10.1103/PhysRevLett.94.157002

We report results of low-temperature thermodynamic and transport measurements of Pb_{1-x}Tl_{x}Te single crystals for Tl concentrations up to the solubility limit of approximately x = 1.5%. For all doped samples, we observe a low-temperature resistivity upturn that scales in magnitude with the Tl concentration. The temperature and field dependence of this upturn are consistent with a charge Kondo effect involving degenerate Tl valence states differing by two electrons, with a characteristic Kondo temperature T_K ~ 6 K. The observation of such an effect supports an electronic pairing mechanism for superconductivity in this material and may account for the anomalously high T_c values.

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